1934-5 Marine Green VACUUM-FIL fountain pen

In 1934 Sheaffer introduced their Vacuum-Fil filling system under the sub-brand VACUUM-FIL. The filler did not come to Sheaffer Balance pens until 1935.Sheaffer Balance pens were available in marine green celluloid from 1930 to 1935. However, they were only lever fillers. Marine green vacuum-filling pens were available only from VACUUM-FIL. The transparent celluloid has darkened a bit. Yet its transparency remains clear enough to easily see the inner workings and the ink level. The plating on the trim is in very good condition.The nib is not hallmarked (e.g. 14 kt) but stamped "VACUUM FIL MADE IN U.S.A." Pen collector lore says the nibs of VACUUM-FIL and WASP pens are 12 karat. They are almost always of thin sheet gold which makes them bouncy and expressive. This nib is not exception. It should not be considered flexible or semi-flexible but it provides lovely line variation under normal writing pressure. It is so much fun.The filler rods on these early pens were made of celluloid cove